<template>
  <div class="app-container">
    <el-row :gutter="10" class="mb8">
      <el-col :span="1.5">
        <el-button type="primary" plain icon="el-icon-plus" size="mini" @click="handleAdd"
          v-hasPermi="['course:chapter:add']">新增</el-button>
      </el-col>
      <el-col :span="1.5">
        <el-button type="info" plain icon="el-icon-sort" size="mini" @click="toggleExpandAll">展开/折叠</el-button>
      </el-col>
      <right-toolbar :showSearch.sync="showSearch" @queryTable="getList"></right-toolbar>
    </el-row>
    <!-- 章节树 -->
    <el-table v-if="refreshTable" v-loading="loading" :data="chapterList" row-key="id" :default-expand-all="isExpandAll"
      :tree-props="{ children: 'children', hasChildren: 'hasChildren' }">
      <el-table-column prop="title" label="章节名称" width="260"></el-table-column>
      <el-table-column prop="orderNum" label="排序" width="200"></el-table-column>
      <el-table-column prop="content" label="内容" width="500"></el-table-column>
      <el-table-column prop="videoUrl" label="视频链接" width="400"></el-table-column>
      <el-table-column label="操作" align="center" class-name="small-padding fixed-width">
        <template slot-scope="scope">
          <el-button size="mini" type="text" icon="el-icon-edit" @click="handleUpdate(scope.row)"
            v-hasPermi="['course:chapter:edit']">修改</el-button>
          <!-- <el-button v-if="scope.row.parentId != 0" size="mini" type="text" icon="el-icon-edit" @click="handleUpdate(scope.row)"
              v-hasPermi="['course:chapter:edit']">修改</el-button> -->
          <el-button size="mini" type="text" icon="el-icon-plus" @click="handleAdd(scope.row)"
            v-hasPermi="['course:chapter:add']">新增</el-button>
          <el-button size="mini" type="text" icon="el-icon-delete" @click="handleDelete(scope.row)"
            v-hasPermi="['course:chapter:remove']">删除</el-button>
        </template>
      </el-table-column>
    </el-table>


    <!-- 添加或修改章节对话框 -->
    <el-dialog :title="title" :visible.sync="open" width="1000px" append-to-body>
      <el-form ref="form" :model="form" :rules="rules" label-width="80px">
        <el-form-item label="章节标题" prop="title">
          <el-input v-model="form.title" placeholder="请输入章节标题" />
        </el-form-item>
        <el-form-item label="章节父节点" prop="parentId">
          <treeselect v-model="form.parentId" :options="chapterOptions" :normalizer="normalizer"
            placeholder="请选择章节父节点" />
        </el-form-item>
        <el-form-item label="排序" prop="orderNum">
          <el-input v-model="form.orderNum" placeholder="请输入排序" />
        </el-form-item>
        <el-form-item label="章节内容" prop="content">
          <editor v-model="form.content" :min-height="192" placeholder="请输入文本内容" />
        </el-form-item>
        <el-form-item label="视频URL" prop="videoUrl">
          <el-input v-model="form.videoUrl" placeholder="请输入视频URL,如果有" />
        </el-form-item>
      </el-form>
      <div slot="footer" class="dialog-footer">
        <el-button type="primary" @click="submitForm">确 定</el-button>
        <el-button @click="cancel">取 消</el-button>
      </div>
    </el-dialog>

  </div>
</template>

<script>
import { listChapter, getChapter, delChapter, addChapter, updateChapter } from "@/api/course/chapter";
import Treeselect from "@riophae/vue-treeselect";
import "@riophae/vue-treeselect/dist/vue-treeselect.css";

export default {
  name: "Chapter",
  components: {
    Treeselect
  },
  data() {
    return {
      // 遮罩层
      loading: true,
      // 显示搜索条件
      showSearch: true,
      courseId: 0,
      // 章节表格数据
      chapterList: [],
      // 章节树选项
      chapterOptions: [],
      // 弹出层标题
      title: "",
      // 是否显示弹出层
      open: false,
      // 是否展开，默认全部展开
      isExpandAll: true,
      // 重新渲染表格状态
      refreshTable: true,
      // 查询参数
      queryParams: {
        courseId: null,
        title: null,
        videoUrl: null,
        parentId: null,
        ancestors: null,
        orderNum: null,
        contentId: null,
        deleteFlag: null
      },
      // 表单参数
      form: {},
      // 表单校验
      rules: {
        courseId: [
          { required: true, message: "课程id不能为空", trigger: "blur" }
        ],
        title: [
          { required: true, message: "章节标题不能为空", trigger: "blur" }
        ],
        parentId: [
          { required: true, message: "章节父节点不能为空", trigger: "blur" }
        ],
        ancestors: [
          { required: true, message: "组级列表不能为空", trigger: "blur" }
        ],
        orderNum: [
          { required: true, message: "排序不能为空", trigger: "blur" }
        ],
        content: [
          { required: true, message: "文本内容不能为空", trigger: "blur" }
        ]
      }
    };
  },
  created() {
    this.courseId = this.$route.params && this.$route.params.courseId;
    if (this.courseId) {
      this.queryParams.courseId = this.courseId
      this.form.courseId = this.courseId
      this.getList();
    }
  },
  methods: {
    /** 查询章节列表 */
    getList() {
      this.loading = true;
      listChapter(this.queryParams).then(response => {
        this.chapterList = this.handleTree(response.data, "id", "parentId");
        this.loading = false;
      });
    },
    /** 转换章节数据结构 */
    normalizer(node) {
      if (node.children && !node.children.length) {
        delete node.children;
      }
      return {
        id: node.id,
        label: node.title,
        children: node.children
      };
    },
    /** 查询章节下拉树结构 */
    getTreeselect() {
      listChapter(this.queryParams).then(response => {
        this.chapterOptions = [];
        const data = { id: 0, title: '顶级节点', children: [] };
        data.children = this.handleTree(response.data, "id", "parentId");
        this.chapterOptions.push(data);
      });
    },
    // 取消按钮
    cancel() {
      this.open = false;
      this.reset();
    },
    // 表单重置
    reset() {
      this.form = {
        id: null,
        courseId: this.courseId,
        title: null,
        videoUrl: null,
        parentId: null,
        ancestors: null,
        orderNum: null,
        contentId: null,
        deleteFlag: null
      };
      this.resetForm("form");
    },
    /** 搜索按钮操作 */
    handleQuery() {
      this.getList();
    },
    /** 重置按钮操作 */
    resetQuery() {
      this.resetForm("queryForm");
      this.handleQuery();
    },
    /** 新增按钮操作 */
    handleAdd(row) {
      this.reset();
      this.getTreeselect();
      if (row != null && row.id) {
        this.form.parentId = row.id;
        this.form.courseId = this.courseId
      } else {
        this.form.parentId = 0;
      }
      this.open = true;
      this.title = "添加章节";
    },
    /** 展开/折叠操作 */
    toggleExpandAll() {
      this.refreshTable = false;
      this.isExpandAll = !this.isExpandAll;
      this.$nextTick(() => {
        this.refreshTable = true;
      });
    },
    /** 修改按钮操作 */
    handleUpdate(row) {
      this.reset();
      this.getTreeselect();
      if (row != null) {
        this.form.parentId = row.id;
      }
      getChapter(row.id).then(response => {
        this.form = response.data;
        this.open = true;
        this.title = "修改章节信息";
      });
    },
    /** 提交按钮 */
    submitForm() {
      this.$refs["form"].validate(valid => {
        if (valid) {
          if (this.form.id != null) {
            updateChapter(this.form).then(response => {
              this.$modal.msgSuccess("修改成功");
              this.open = false;
              this.getList();
            });
          } else {
            addChapter(this.form).then(response => {
              this.$modal.msgSuccess("新增成功");
              this.open = false;
              this.getList();
            });
          }
        }
      });
    },
    /** 删除按钮操作 */
    handleDelete(row) {
      this.$modal.confirm('是否确认删除章节编号为"' + row.id + '"的数据项？').then(function () {
        return delChapter(row.id);
      }).then(() => {
        this.getList();
        this.$modal.msgSuccess("删除成功");
      }).catch(() => { });
    }
  }
};
</script>
